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2003beriozina
@2003beriozina
July 2022
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Корнями какого уравнения являются числа 2 и -1
X2 – 3x + 2 = 0
X2 + 3x + = 0
X2 – x – 2 = 0
X2 +x – 2 = 0
(x2 это х во второй степени)
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krugly1981
X² - x - 2 = 0
D = b²- 4ac = 1 - 4×(-2) = 9 = 3²
x1 = ( 1 + 3) / 2 = 2
x2 = ( 1 - 3) / 2 = - 1
3 votes
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Answers & Comments
D = b²- 4ac = 1 - 4×(-2) = 9 = 3²
x1 = ( 1 + 3) / 2 = 2
x2 = ( 1 - 3) / 2 = - 1